Developments and research directions in pipe jacking and microtunneling

A method to estimate the jacking force for pipe jacking in sandy soils

Research of surface settlement for a single arch long-span subway station using the Pipe-roof Pre-construction Method

A jacking force study of curved steel pipe roof in Gongbei tunnel: Calculation review and monitoring data analysis

A large-scale physical model test on frozen status in freeze-sealing pipe roof method for tunnel construction

Key techniques for the largest curved pipe jacking roof to date: A case study of Gongbei tunnel

The invention provides a method for receiving a pipe jacking machine under condition of high water pressure complicated geological conditions. In the process when the pipe jacking machine extends out of a wall, air is charged into a receiving chamber and muddy water is discharged to always keep balance between the air pressure in the receiving chamber and the formation water pressure; after the pipe jacking machine completely goes into the receiving chamber, a sealing slurry is injected into the gap between a pipeline and the hole wall of a receiving well to seal and stop water, and the muddy water is discharged to reduce the pressure after the sealing slurry is solidified. The invention also provides a device for receiving the pipe jacking machine for the method; the device comprises an orifice pipe, a flange pipe, the receiving chamber, and a pressure stabilizing chamber, all of which are orderly and integrally connected together from back to front; an air bag is arranged in the pressure stabilizing chamber; the receiving method is suitable for various formations, in particular weak soil and sandy soil formations high in water and soil pressure at the receiving end, poor geological conditions and difficult to guarantee in reinforcement quality, and is high in receiving safety; if the device is applied to receiving the pipe jacking machine, the reinforcement to the soil at the receiving end can be reduced and even avoided; besides, the device can be recovered and reused, so that the construction cost can be reduced.

Method and device for receiving pipe jacking machine under condition of high water pressure complicated geological conditions

The Gongbei Tunnel is currently being constructed in Zhuhai, with a combination of curved pipe jacking roof for ground support and ground freezing waterproof applied, to guarantee the tunnel traverse under the Gongbei Port. This pipe roof is comprised 36 steel curved jacking pipe strings of 1620 mm diameter with 355mm~358mm gap between adjacent strings. The pipe jacking construction has been faced with various challenges due to the site conditions of multiple soft soil and high groundwater pressure. These challenges include risks of excessive soil deformation, possibility of path deviation, excessive jacking force, leaking of pipe joint seals and failure of gasketed launch seal and reception. This paper will provide an overview of this project and summarize the most challenging aspects they faced. The relevant techniques applied during construction, such as selection of pipe jacking machine, controlling trajectory of close curved pipe jacking, sealing test of pipe joint, pipe jacking mud in rich salt multiple formations and pipe jacking reception device under high underground water pressure are introduced in detail last.

Steel Curved Pipe Jacking Construction under Complicated Conditions for a Curved Pipe Roof

The invention relates to a tube push bench receiving device and method under the high-water-pressure condition. The device comprises an orifice tube, a flange tube, a steel sleeve receiving cabin, a vent valve, a pressure stabilizing tube, a pressure stabilizing cabin, a pressure gauge, a drain valve and an overflowing valve, wherein the orifice tube, the flange tube, the steel sleeve receiving cabin and the pressure stabilizing cabin are sequentially connected, the vent valve is installed on the steel sleeve receiving cabin, and the pressure stabilizing tube, the pressure gauge, the drain valve and the overflowing valve are installed on a pressure stabilizing cabin body. Y-shaped sealing rubber rings are installed at the two ends of the flange tube, have a good sealing effect and are used for eliminating the water and thick liquid leaking problems caused by stratum high-water-pressure conditions when a tube push bench is received. The method is based on the slurry balance principle, the slurry pressure in the steel sleeve receiving cabin and the stratum water and soil pressure are kept balanced by adjusting the pressure of gas in the pressure stabilizing cabin, and the tube push bench is safely and reliably received. By means of the application of the device and the method, the reinforcing and rainfall construction of a soil body at the receiving end can be removed, the device is recycled, and the construction cost is reduced.

Tube push bench receiving device and method under high-water-pressure condition

The invention provides a test method and device for testing the sealing property of a pipe-jacking construction device. The two ends of a receiving bin are provided with sealing rings and connected with a pressure stabilizing bin to form a pipe-jacking receiving device. A casing pipe is installed at the rear end of the pipe-jacking receiving device. A starting opening water stopping sealing device is installed at the rear end of the casing pipe, and pipe joint sets are jacked forward in sequence to enable the front ends to enter the receiving bin and the rear ends to be located outside the casing pipe, so that a sealing cavity is formed between the casing pipe and the pipe joint sets, and a sealing cavity is formed between the pipe-jacking receiving device and the pipe joint sets; the two sealing cavities are filled with mud to simulate a mud sleeve; the pipe joint sets are jacked and pressed, then the two sealing cavities are inflated and pressurized till air pressure is equal to stratum water pressure verified through testing, and whether mud overflows from the outside of the starting opening water stopping sealing device, joint positions in the pipe joint sets and the outside of the pipe-jacking receiving device is observed. According to the method, before construction is carried out, the sealing property of a pipe-jacking construction device can be tested in advance, and the test device is low in cost, convenient to operate and capable of testing the sealing property of the pipe-jacking construction device under the high water pressure condition.

Test method and device for testing sealing property of pipe-jacking construction device

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